No battery is needed. No friction on any parts of bicycle. You will not feel any extra weight as you are cycling.

 Based on a newly invented generator, this light system works regardless the bicycle's speed and weather conditions(Normal dynamo will lose its power when bicycle is slow down or in wet days). 

Very bright flashing lights (4 white LEDs in front and 3 red LEDs at back).  
 You bid a No-friction bicycle light dynamo with front and back lights (Product code: P1), easy installation.  It can be used as a stand-alone light system on your bike, or used as a back-up for your existed battery-powered lights.  Full water proof.  

For more details of this product (more pictures, how it works, instructions...),  please go to our website, address:  freelights(dot)co(dot)uk  

Online Instructions.  

Items will ship to your paypal or credit card address. Flat rate postage to all buyers, air-mail with a tracking number from China. 
 
The product comes with necessary screws, cable ties.